Foreign steel structure engineering construction effectively improve the fire resistance

The steel structure commonly used in the construction industry has many advantages such as light weight, recycling and recycling of materials, but because the steel itself is not able to withstand high temperature, it affects the safety of steel structure buildings and hinders the development of steel structure manufacturers.

1, the application of building refractory, weathering steel general steel fire resistance is poor, but through relevant technical means, change the material composition of steel, add specific components, change the structure and metallographic organization of steel, improve the fire resistance and weather resistance of steel itself. This is fire-resistant and weather-resistant steel. When the temperature of this steel reaches 600℃, the strength decreases by less than 30%, in addition, because of its better fire resistance table, the thickness of the protective layer can be properly reduced during construction, and even the anti-rust paint can be not applied, which can save a certain cost. The application of fire-resistant, weather-resistant steel is a cure, should be vigorously promoted, at present, China has a number of enterprises can produce building refractory, weather-resistant steel, which provides a good source of materials for steel structure buildings.

2, the use of strong fire resistance of the structural form and the fire resistance of the pure steel structure is relatively poor, but it can be properly combined with concrete to form a mixed component, or directly use reinforced concrete structure in some key parts. For example, concrete filled steel tube columns can be used, which can effectively improve the fire resistance limit, and the larger the diameter of the steel tube, the longer the fire resistance time, the 500mm diameter of the round steel tube concrete column, when coated with 15mm thick thermal insulation fireproof paint can meet the fire resistance time of 3h. And such as floors and stairs with high fire protection requirements should still use reinforced concrete structure as much as possible.

3, adopt a reasonable steel structure fire protection treatment program steel structure fire protection construction practice should be reasonable, strong, economic, easy to construction, and conducive to decoration. When there is a non-combustible enclosure or divider on the same axis as the steel member, the non-combustible wall itself can be used to provide fire protection for the steel member, without the need to make another fire protection layer. For those exposed steel components, reasonable fire protection construction practices should be adopted.

4, the implementation of effective fire protection methods commonly used steel structure fire protection methods are outsourced concrete protection, steel wire mesh cement mortar, outsourced fire plate and spraying fire paint. External concrete protection is to completely wrap the steel member with concrete, and structural steel bars should be configured in the concrete to prevent the concrete from falling off. Steel wire mesh cement mortar fire protection is the use of metal mesh smeared 50# mortar as a protective layer, is also a traditional construction method. The fire-proof board can be made of fiber-reinforced cement board, gypsum board, calcium silicate board, hirudite SLATE and other non-combustible materials to wrap the steel members.

The fire resistance of steel structure depends on the steel, the steel itself does not burn, but also has good heat resistance, based on this physical property of steel, foreign steel structure engineering this green building structure form has been quite popular in developed countries, do not let the fire resistance hinder the footsteps of steel structure manufacturers, we should take various effective measures to improve the fire resistance of steel structure, Accelerate the development of steel structures.